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| Rev | Author | Line No. | Line |
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| 57 | pj | 1 | /* $Id: s_alphabuf.c,v 1.1 2003-02-28 11:49:41 pj Exp $ */ |
| 2 | |||
| 3 | /* |
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| 4 | * Mesa 3-D graphics library |
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| 5 | * Version: 4.1 |
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| 6 | * |
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| 7 | * Copyright (C) 1999-2002 Brian Paul All Rights Reserved. |
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| 8 | * |
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| 9 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 10 | * copy of this software and associated documentation files (the "Software"), |
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| 11 | * to deal in the Software without restriction, including without limitation |
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| 12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 13 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 14 | * Software is furnished to do so, subject to the following conditions: |
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| 15 | * |
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| 16 | * The above copyright notice and this permission notice shall be included |
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| 17 | * in all copies or substantial portions of the Software. |
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| 18 | * |
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| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 22 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
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| 23 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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| 24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 25 | */ |
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| 26 | |||
| 27 | |||
| 28 | /* |
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| 29 | * Software alpha planes. Many frame buffers don't have alpha bits so |
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| 30 | * we simulate them in software. |
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| 31 | */ |
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| 32 | |||
| 33 | |||
| 34 | #include "glheader.h" |
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| 35 | #include "context.h" |
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| 36 | #include "imports.h" |
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| 37 | |||
| 38 | #include "s_context.h" |
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| 39 | #include "s_alphabuf.h" |
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| 40 | |||
| 41 | |||
| 42 | /* |
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| 43 | * Allocate a new front and back alpha buffer. |
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| 44 | */ |
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| 45 | void |
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| 46 | _mesa_alloc_alpha_buffers( GLframebuffer *buffer ) |
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| 47 | { |
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| 48 | const GLint bytes = buffer->Width * buffer->Height * sizeof(GLchan); |
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| 49 | |||
| 50 | ASSERT(buffer->UseSoftwareAlphaBuffers); |
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| 51 | |||
| 52 | if (buffer->FrontLeftAlpha) { |
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| 53 | MESA_PBUFFER_FREE( buffer->FrontLeftAlpha ); |
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| 54 | } |
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| 55 | buffer->FrontLeftAlpha = MESA_PBUFFER_ALLOC( bytes ); |
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| 56 | if (!buffer->FrontLeftAlpha) { |
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| 57 | /* out of memory */ |
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| 58 | _mesa_error( NULL, GL_OUT_OF_MEMORY, |
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| 59 | "Couldn't allocate front-left alpha buffer" ); |
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| 60 | } |
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| 61 | |||
| 62 | if (buffer->Visual.doubleBufferMode) { |
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| 63 | if (buffer->BackLeftAlpha) { |
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| 64 | MESA_PBUFFER_FREE( buffer->BackLeftAlpha ); |
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| 65 | } |
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| 66 | buffer->BackLeftAlpha = MESA_PBUFFER_ALLOC( bytes ); |
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| 67 | if (!buffer->BackLeftAlpha) { |
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| 68 | /* out of memory */ |
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| 69 | _mesa_error( NULL, GL_OUT_OF_MEMORY, |
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| 70 | "Couldn't allocate back-left alpha buffer" ); |
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| 71 | } |
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| 72 | } |
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| 73 | |||
| 74 | if (buffer->Visual.stereoMode) { |
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| 75 | if (buffer->FrontRightAlpha) { |
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| 76 | MESA_PBUFFER_FREE( buffer->FrontRightAlpha ); |
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| 77 | } |
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| 78 | buffer->FrontRightAlpha = MESA_PBUFFER_ALLOC( bytes ); |
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| 79 | if (!buffer->FrontRightAlpha) { |
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| 80 | /* out of memory */ |
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| 81 | _mesa_error( NULL, GL_OUT_OF_MEMORY, |
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| 82 | "Couldn't allocate front-right alpha buffer" ); |
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| 83 | } |
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| 84 | |||
| 85 | if (buffer->Visual.doubleBufferMode) { |
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| 86 | if (buffer->BackRightAlpha) { |
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| 87 | MESA_PBUFFER_FREE( buffer->BackRightAlpha ); |
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| 88 | } |
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| 89 | buffer->BackRightAlpha = MESA_PBUFFER_ALLOC( bytes ); |
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| 90 | if (!buffer->BackRightAlpha) { |
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| 91 | /* out of memory */ |
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| 92 | _mesa_error( NULL, GL_OUT_OF_MEMORY, |
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| 93 | "Couldn't allocate back-right alpha buffer" ); |
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| 94 | } |
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| 95 | } |
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| 96 | } |
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| 97 | } |
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| 98 | |||
| 99 | |||
| 100 | /* |
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| 101 | * Clear all the alpha buffers |
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| 102 | */ |
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| 103 | void |
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| 104 | _mesa_clear_alpha_buffers( GLcontext *ctx ) |
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| 105 | { |
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| 106 | const GLchan aclear = (GLchan) ctx->Color.ClearColor[3]; |
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| 107 | GLuint bufferBit; |
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| 108 | |||
| 109 | ASSERT(ctx->DrawBuffer->UseSoftwareAlphaBuffers); |
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| 110 | ASSERT(ctx->Color.ColorMask[ACOMP]); |
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| 111 | |||
| 112 | /* loop over four possible alpha buffers */ |
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| 113 | for (bufferBit = 1; bufferBit <= 8; bufferBit = bufferBit << 1) { |
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| 114 | if (bufferBit & ctx->Color._DrawDestMask) { |
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| 115 | GLchan *buffer; |
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| 116 | if (bufferBit == FRONT_LEFT_BIT) { |
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| 117 | buffer = (GLchan *) ctx->DrawBuffer->FrontLeftAlpha; |
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| 118 | } |
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| 119 | else if (bufferBit == FRONT_RIGHT_BIT) { |
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| 120 | buffer = (GLchan *) ctx->DrawBuffer->FrontRightAlpha; |
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| 121 | } |
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| 122 | else if (bufferBit == BACK_LEFT_BIT) { |
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| 123 | buffer = (GLchan *) ctx->DrawBuffer->BackLeftAlpha; |
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| 124 | } |
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| 125 | else { |
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| 126 | buffer = (GLchan *) ctx->DrawBuffer->BackRightAlpha; |
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| 127 | } |
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| 128 | |||
| 129 | if (ctx->Scissor.Enabled) { |
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| 130 | /* clear scissor region */ |
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| 131 | GLint j; |
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| 132 | GLint rowLen = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin; |
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| 133 | GLint rows = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin; |
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| 134 | GLint width = ctx->DrawBuffer->Width; |
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| 135 | GLchan *aptr = buffer |
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| 136 | + ctx->DrawBuffer->_Ymin * ctx->DrawBuffer->Width |
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| 137 | + ctx->DrawBuffer->_Xmin; |
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| 138 | for (j = 0; j < rows; j++) { |
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| 139 | #if CHAN_BITS == 8 |
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| 140 | MEMSET( aptr, aclear, rowLen ); |
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| 141 | #elif CHAN_BITS == 16 |
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| 142 | MEMSET16( aptr, aclear, rowLen ); |
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| 143 | #else |
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| 144 | GLint i; |
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| 145 | for (i = 0; i < rowLen; i++) { |
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| 146 | aptr[i] = aclear; |
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| 147 | } |
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| 148 | #endif |
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| 149 | aptr += width; |
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| 150 | } |
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| 151 | } |
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| 152 | else { |
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| 153 | /* clear whole buffer */ |
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| 154 | GLuint pixels = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height; |
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| 155 | #if CHAN_BITS == 8 |
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| 156 | MEMSET(buffer, aclear, pixels); |
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| 157 | #elif CHAN_BITS == 16 |
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| 158 | MEMSET16(buffer, aclear, pixels); |
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| 159 | #else |
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| 160 | GLuint i; |
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| 161 | for (i = 0; i < pixels; i++) { |
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| 162 | buffer[i] = aclear; |
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| 163 | } |
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| 164 | #endif |
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| 165 | } |
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| 166 | } |
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| 167 | } |
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| 168 | } |
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| 169 | |||
| 170 | |||
| 171 | |||
| 172 | static INLINE |
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| 173 | GLchan *get_alpha_buffer( GLcontext *ctx ) |
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| 174 | { |
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| 175 | SWcontext *swrast = SWRAST_CONTEXT(ctx); |
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| 176 | |||
| 177 | switch (swrast->CurrentBuffer) { |
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| 178 | case FRONT_LEFT_BIT: |
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| 179 | return (GLchan *) ctx->DrawBuffer->FrontLeftAlpha; |
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| 180 | break; |
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| 181 | case BACK_LEFT_BIT: |
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| 182 | return (GLchan *) ctx->DrawBuffer->BackLeftAlpha; |
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| 183 | break; |
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| 184 | case FRONT_RIGHT_BIT: |
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| 185 | return (GLchan *) ctx->DrawBuffer->FrontRightAlpha; |
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| 186 | break; |
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| 187 | case BACK_RIGHT_BIT: |
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| 188 | return (GLchan *) ctx->DrawBuffer->BackRightAlpha; |
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| 189 | break; |
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| 190 | default: |
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| 191 | _mesa_problem(ctx, "Bad CurrentBuffer in get_alpha_buffer()"); |
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| 192 | return (GLchan *) ctx->DrawBuffer->FrontLeftAlpha; |
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| 193 | } |
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| 194 | } |
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| 195 | |||
| 196 | |||
| 197 | void |
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| 198 | _mesa_write_alpha_span( GLcontext *ctx, GLuint n, GLint x, GLint y, |
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| 199 | CONST GLchan rgba[][4], const GLubyte mask[] ) |
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| 200 | { |
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| 201 | GLchan *buffer, *aptr; |
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| 202 | GLuint i; |
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| 203 | |||
| 204 | buffer = get_alpha_buffer(ctx); |
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| 205 | aptr = buffer + y * ctx->DrawBuffer->Width + x; |
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| 206 | |||
| 207 | if (mask) { |
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| 208 | for (i=0;i<n;i++) { |
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| 209 | if (mask[i]) { |
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| 210 | *aptr = rgba[i][ACOMP]; |
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| 211 | } |
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| 212 | aptr++; |
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| 213 | } |
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| 214 | } |
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| 215 | else { |
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| 216 | for (i=0;i<n;i++) { |
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| 217 | *aptr++ = rgba[i][ACOMP]; |
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| 218 | } |
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| 219 | } |
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| 220 | } |
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| 221 | |||
| 222 | |||
| 223 | void |
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| 224 | _mesa_write_mono_alpha_span( GLcontext *ctx, GLuint n, GLint x, GLint y, |
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| 225 | GLchan alpha, const GLubyte mask[] ) |
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| 226 | { |
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| 227 | GLchan *buffer, *aptr; |
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| 228 | GLuint i; |
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| 229 | |||
| 230 | buffer = get_alpha_buffer(ctx); |
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| 231 | aptr = buffer + y * ctx->DrawBuffer->Width + x; |
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| 232 | |||
| 233 | if (mask) { |
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| 234 | for (i=0;i<n;i++) { |
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| 235 | if (mask[i]) { |
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| 236 | *aptr = alpha; |
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| 237 | } |
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| 238 | aptr++; |
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| 239 | } |
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| 240 | } |
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| 241 | else { |
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| 242 | for (i=0;i<n;i++) { |
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| 243 | *aptr++ = alpha; |
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| 244 | } |
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| 245 | } |
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| 246 | } |
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| 247 | |||
| 248 | |||
| 249 | void |
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| 250 | _mesa_write_alpha_pixels( GLcontext *ctx, |
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| 251 | GLuint n, const GLint x[], const GLint y[], |
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| 252 | CONST GLchan rgba[][4], const GLubyte mask[] ) |
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| 253 | { |
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| 254 | GLchan *buffer; |
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| 255 | GLuint i; |
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| 256 | |||
| 257 | buffer = get_alpha_buffer(ctx); |
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| 258 | |||
| 259 | if (mask) { |
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| 260 | for (i=0;i<n;i++) { |
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| 261 | if (mask[i]) { |
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| 262 | GLchan *aptr = buffer + y[i] * ctx->DrawBuffer->Width + x[i]; |
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| 263 | *aptr = rgba[i][ACOMP]; |
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| 264 | } |
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| 265 | } |
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| 266 | } |
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| 267 | else { |
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| 268 | for (i=0;i<n;i++) { |
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| 269 | GLchan *aptr = buffer + y[i] * ctx->DrawBuffer->Width + x[i]; |
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| 270 | *aptr = rgba[i][ACOMP]; |
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| 271 | } |
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| 272 | } |
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| 273 | } |
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| 274 | |||
| 275 | |||
| 276 | void |
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| 277 | _mesa_write_mono_alpha_pixels( GLcontext *ctx, |
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| 278 | GLuint n, const GLint x[], const GLint y[], |
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| 279 | GLchan alpha, const GLubyte mask[] ) |
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| 280 | { |
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| 281 | GLchan *buffer; |
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| 282 | GLuint i; |
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| 283 | |||
| 284 | buffer = get_alpha_buffer(ctx); |
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| 285 | |||
| 286 | if (mask) { |
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| 287 | for (i=0;i<n;i++) { |
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| 288 | if (mask[i]) { |
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| 289 | GLchan *aptr = buffer + y[i] * ctx->DrawBuffer->Width + x[i]; |
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| 290 | *aptr = alpha; |
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| 291 | } |
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| 292 | } |
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| 293 | } |
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| 294 | else { |
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| 295 | for (i=0;i<n;i++) { |
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| 296 | GLchan *aptr = buffer + y[i] * ctx->DrawBuffer->Width + x[i]; |
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| 297 | *aptr = alpha; |
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| 298 | } |
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| 299 | } |
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| 300 | } |
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| 301 | |||
| 302 | |||
| 303 | |||
| 304 | void |
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| 305 | _mesa_read_alpha_span( GLcontext *ctx, |
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| 306 | GLuint n, GLint x, GLint y, GLchan rgba[][4] ) |
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| 307 | { |
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| 308 | const GLchan *buffer, *aptr; |
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| 309 | GLuint i; |
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| 310 | |||
| 311 | buffer = get_alpha_buffer(ctx); |
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| 312 | aptr = buffer + y * ctx->DrawBuffer->Width + x; |
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| 313 | |||
| 314 | for (i = 0; i < n; i++) |
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| 315 | rgba[i][ACOMP] = *aptr++; |
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| 316 | } |
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| 317 | |||
| 318 | |||
| 319 | void |
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| 320 | _mesa_read_alpha_pixels( GLcontext *ctx, |
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| 321 | GLuint n, const GLint x[], const GLint y[], |
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| 322 | GLchan rgba[][4], const GLubyte mask[] ) |
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| 323 | { |
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| 324 | const GLchan *buffer; |
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| 325 | GLuint i; |
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| 326 | |||
| 327 | buffer = get_alpha_buffer(ctx); |
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| 328 | |||
| 329 | for (i = 0; i < n; i++) { |
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| 330 | if (mask[i]) { |
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| 331 | const GLchan *aptr = buffer + y[i] * ctx->DrawBuffer->Width + x[i]; |
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| 332 | rgba[i][ACOMP] = *aptr; |
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| 333 | } |
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| 334 | } |
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| 335 | } |