| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "cc/resources/resource_format.h" |
| |
| #include "third_party/khronos/GLES2/gl2.h" |
| #include "third_party/khronos/GLES2/gl2ext.h" |
| |
| namespace cc { |
| |
| int BitsPerPixel(ResourceFormat format) { |
| switch (format) { |
| case BGRA_8888: |
| case RGBA_8888: |
| return 32; |
| case RGBA_4444: |
| case RGB_565: |
| case LUMINANCE_F16: |
| return 16; |
| case ALPHA_8: |
| case LUMINANCE_8: |
| case RED_8: |
| return 8; |
| case ETC1: |
| return 4; |
| } |
| NOTREACHED(); |
| return 0; |
| } |
| |
| GLenum GLDataType(ResourceFormat format) { |
| DCHECK_LE(format, RESOURCE_FORMAT_MAX); |
| static const GLenum format_gl_data_type[] = { |
| GL_UNSIGNED_BYTE, // RGBA_8888 |
| GL_UNSIGNED_SHORT_4_4_4_4, // RGBA_4444 |
| GL_UNSIGNED_BYTE, // BGRA_8888 |
| GL_UNSIGNED_BYTE, // ALPHA_8 |
| GL_UNSIGNED_BYTE, // LUMINANCE_8 |
| GL_UNSIGNED_SHORT_5_6_5, // RGB_565, |
| GL_UNSIGNED_BYTE, // ETC1 |
| GL_UNSIGNED_BYTE, // RED_8 |
| GL_HALF_FLOAT_OES, // LUMINANCE_F16 |
| }; |
| static_assert(arraysize(format_gl_data_type) == (RESOURCE_FORMAT_MAX + 1), |
| "format_gl_data_type does not handle all cases."); |
| |
| return format_gl_data_type[format]; |
| } |
| |
| GLenum GLDataFormat(ResourceFormat format) { |
| DCHECK_LE(format, RESOURCE_FORMAT_MAX); |
| static const GLenum format_gl_data_format[] = { |
| GL_RGBA, // RGBA_8888 |
| GL_RGBA, // RGBA_4444 |
| GL_BGRA_EXT, // BGRA_8888 |
| GL_ALPHA, // ALPHA_8 |
| GL_LUMINANCE, // LUMINANCE_8 |
| GL_RGB, // RGB_565 |
| GL_ETC1_RGB8_OES, // ETC1 |
| GL_RED_EXT, // RED_8 |
| GL_LUMINANCE, // LUMINANCE_F16 |
| }; |
| static_assert(arraysize(format_gl_data_format) == (RESOURCE_FORMAT_MAX + 1), |
| "format_gl_data_format does not handle all cases."); |
| return format_gl_data_format[format]; |
| } |
| |
| GLenum GLInternalFormat(ResourceFormat format) { |
| // In GLES2, the internal format must match the texture format. (It no longer |
| // is true in GLES3, however it still holds for the BGRA extension.) |
| return GLDataFormat(format); |
| } |
| |
| GLenum GLCopyTextureInternalFormat(ResourceFormat format) { |
| // In GLES2, valid formats for glCopyTexImage2D are: GL_ALPHA, GL_LUMINANCE, |
| // GL_LUMINANCE_ALPHA, GL_RGB, or GL_RGBA. |
| // Extensions typically used for glTexImage2D do not also work for |
| // glCopyTexImage2D. For instance GL_BGRA_EXT may not be used for |
| // anything but gl(Sub)TexImage2D: |
| // https://www.khronos.org/registry/gles/extensions/EXT/EXT_texture_format_BGRA8888.txt |
| DCHECK_LE(format, RESOURCE_FORMAT_MAX); |
| static const GLenum format_gl_data_format[] = { |
| GL_RGBA, // RGBA_8888 |
| GL_RGBA, // RGBA_4444 |
| GL_RGBA, // BGRA_8888 |
| GL_ALPHA, // ALPHA_8 |
| GL_LUMINANCE, // LUMINANCE_8 |
| GL_RGB, // RGB_565 |
| GL_RGB, // ETC1 |
| GL_LUMINANCE, // RED_8 |
| GL_LUMINANCE, // LUMINANCE_F16 |
| }; |
| static_assert(arraysize(format_gl_data_format) == (RESOURCE_FORMAT_MAX + 1), |
| "format_gl_data_format does not handle all cases."); |
| return format_gl_data_format[format]; |
| } |
| |
| gfx::BufferFormat BufferFormat(ResourceFormat format) { |
| switch (format) { |
| case BGRA_8888: |
| return gfx::BufferFormat::BGRA_8888; |
| case RED_8: |
| return gfx::BufferFormat::R_8; |
| case RGBA_4444: |
| return gfx::BufferFormat::RGBA_4444; |
| case RGBA_8888: |
| return gfx::BufferFormat::RGBA_8888; |
| case ETC1: |
| return gfx::BufferFormat::ETC1; |
| case ALPHA_8: |
| case LUMINANCE_8: |
| case RGB_565: |
| case LUMINANCE_F16: |
| break; |
| } |
| NOTREACHED(); |
| return gfx::BufferFormat::RGBA_8888; |
| } |
| |
| bool IsResourceFormatCompressed(ResourceFormat format) { |
| return format == ETC1; |
| } |
| |
| bool DoesResourceFormatSupportAlpha(ResourceFormat format) { |
| switch (format) { |
| case RGBA_4444: |
| case RGBA_8888: |
| case BGRA_8888: |
| case ALPHA_8: |
| return true; |
| case LUMINANCE_8: |
| case RGB_565: |
| case ETC1: |
| case RED_8: |
| case LUMINANCE_F16: |
| return false; |
| } |
| NOTREACHED(); |
| return false; |
| } |
| |
| } // namespace cc |