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mojoshader_sdlgpu.c
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mojoshader_sdlgpu.c
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/**
* MojoShader; generate shader programs from bytecode of compiled
* Direct3D shaders.
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
#define __MOJOSHADER_INTERNAL__ 1
#include "mojoshader_internal.h"
#ifdef USE_SDL3 /* Private define, for now */
#include <SDL3/SDL.h>
#define SDL_GPU_SHADERCROSS_IMPLEMENTATION
#include "spirv/SDL_gpu_shadercross.h"
/* Max entries for each register file type */
#define MAX_REG_FILE_F 8192
#define MAX_REG_FILE_I 2047
#define MAX_REG_FILE_B 2047
struct MOJOSHADER_sdlContext
{
SDL_GPUDevice *device;
const char *profile;
MOJOSHADER_malloc malloc_fn;
MOJOSHADER_free free_fn;
void *malloc_data;
/* The constant register files...
* !!! FIXME: Man, it kills me how much memory this takes...
* !!! FIXME: ... make this dynamically allocated on demand.
*/
float vs_reg_file_f[MAX_REG_FILE_F * 4];
int32_t vs_reg_file_i[MAX_REG_FILE_I * 4];
uint8_t vs_reg_file_b[MAX_REG_FILE_B * 4];
float ps_reg_file_f[MAX_REG_FILE_F * 4];
int32_t ps_reg_file_i[MAX_REG_FILE_I * 4];
uint8_t ps_reg_file_b[MAX_REG_FILE_B * 4];
uint8_t *uniform_staging;
uint32_t uniform_staging_length;
MOJOSHADER_sdlShaderData *bound_vshader_data;
MOJOSHADER_sdlShaderData *bound_pshader_data;
MOJOSHADER_sdlProgram *bound_program;
HashTable *linker_cache;
};
struct MOJOSHADER_sdlShaderData
{
const MOJOSHADER_parseData *parseData;
uint16_t tag;
uint32_t refcount;
uint32_t samplerSlots;
int32_t uniformBufferSize;
};
struct MOJOSHADER_sdlProgram
{
SDL_GPUShader *vertexShader;
SDL_GPUShader *pixelShader;
MOJOSHADER_sdlShaderData *vertexShaderData;
MOJOSHADER_sdlShaderData *pixelShaderData;
};
/* Error state... */
static char error_buffer[1024] = { '\0' };
static void set_error(const char *str)
{
snprintf(error_buffer, sizeof (error_buffer), "%s", str);
} // set_error
static inline void out_of_memory(void)
{
set_error("out of memory");
} // out_of_memory
/* Internals */
typedef struct LinkedShaderData
{
MOJOSHADER_sdlShaderData *vertex;
MOJOSHADER_sdlShaderData *fragment;
MOJOSHADER_sdlVertexAttribute vertexAttributes[16];
uint32_t vertexAttributeCount;
} LinkedShaderData;
static uint32_t hash_shaders(const void *sym, void *data)
{
(void) data;
const LinkedShaderData *s = (const LinkedShaderData *) sym;
const uint32_t HASH_FACTOR = 31;
uint32_t hash = s->vertexAttributeCount;
for (uint32_t i = 0; i < s->vertexAttributeCount; i += 1)
{
hash = hash * HASH_FACTOR + s->vertexAttributes[i].usage;
hash = hash * HASH_FACTOR + s->vertexAttributes[i].usageIndex;
hash = hash * HASH_FACTOR + s->vertexAttributes[i].vertexElementFormat;
}
hash = hash * HASH_FACTOR + s->vertex->tag;
hash = hash * HASH_FACTOR + s->fragment->tag;
return hash;
} // hash_shaders
static int match_shaders(const void *_a, const void *_b, void *data)
{
(void) data;
const LinkedShaderData *a = (const LinkedShaderData *) _a;
const LinkedShaderData *b = (const LinkedShaderData *) _b;
const uint16_t av = (a->vertex) ? a->vertex->tag : 0;
const uint16_t bv = (b->vertex) ? b->vertex->tag : 0;
if (av != bv)
return 0;
const uint16_t af = (a->fragment) ? a->fragment->tag : 0;
const uint16_t bf = (b->fragment) ? b->fragment->tag : 0;
if (af != bf)
return 0;
if (a->vertexAttributeCount != b->vertexAttributeCount)
return 0;
for (uint32_t i = 0; i < a->vertexAttributeCount; i += 1)
{
if (a->vertexAttributes[i].usage != b->vertexAttributes[i].usage)
{
return 0;
}
if (a->vertexAttributes[i].usageIndex != b->vertexAttributes[i].usageIndex)
{
return 0;
}
if (a->vertexAttributes[i].vertexElementFormat != b->vertexAttributes[i].vertexElementFormat)
{
return 0;
}
}
return 1;
} // match_shaders
static void nuke_shaders(
const void *_ctx,
const void *key,
const void *value,
void *data
) {
MOJOSHADER_sdlContext *ctx = (MOJOSHADER_sdlContext *) _ctx;
(void) data;
ctx->free_fn((void *) key, ctx->malloc_data); // this was a LinkedShaderData struct.
MOJOSHADER_sdlDeleteProgram(ctx, (MOJOSHADER_sdlProgram *) value);
} // nuke_shaders
static uint8_t update_uniform_buffer(
MOJOSHADER_sdlContext *ctx,
SDL_GPUCommandBuffer *cb,
MOJOSHADER_sdlShaderData *shader,
float *regF,
int *regI,
uint8_t *regB
) {
int32_t i, j;
int32_t offset;
uint32_t *contentsI;
if (shader->uniformBufferSize > ctx->uniform_staging_length)
{
ctx->free_fn(ctx->uniform_staging, ctx->malloc_data);
ctx->uniform_staging = ctx->malloc_fn(shader->uniformBufferSize, ctx->malloc_data);
ctx->uniform_staging_length = shader->uniformBufferSize;
} // if
offset = 0;
for (i = 0; i < shader->parseData->uniform_count; i++)
{
const int32_t index = shader->parseData->uniforms[i].index;
const int32_t arrayCount = shader->parseData->uniforms[i].array_count;
const int32_t size = arrayCount ? arrayCount : 1;
switch (shader->parseData->uniforms[i].type)
{
case MOJOSHADER_UNIFORM_FLOAT:
memcpy(
ctx->uniform_staging + offset,
®F[4 * index],
size * 16
);
break;
case MOJOSHADER_UNIFORM_INT:
memcpy(
ctx->uniform_staging + offset,
®I[4 * index],
size * 16
);
break;
case MOJOSHADER_UNIFORM_BOOL:
contentsI = (uint32_t *) (ctx->uniform_staging + offset);
for (j = 0; j < size; j++)
contentsI[j * 4] = regB[index + j];
break;
default:
set_error(
"SOMETHING VERY WRONG HAPPENED WHEN UPDATING UNIFORMS"
);
assert(0);
break;
} // switch
offset += size * 16;
} // for
return 1; // FIXME: Return 0 when uniform data is unchanged
} // update_uniform_buffer
/* Public API */
unsigned int MOJOSHADER_sdlGetShaderFormats(void)
{
SDL_ShaderCross_Init();
return SDL_ShaderCross_GetSPIRVShaderFormats();
} // MOJOSHADER_sdlGetShaderFormats
MOJOSHADER_sdlContext *MOJOSHADER_sdlCreateContext(
SDL_GPUDevice *device,
MOJOSHADER_malloc m,
MOJOSHADER_free f,
void *malloc_d
) {
MOJOSHADER_sdlContext* resultCtx;
if (m == NULL) m = MOJOSHADER_internal_malloc;
if (f == NULL) f = MOJOSHADER_internal_free;
resultCtx = (MOJOSHADER_sdlContext*) m(sizeof(MOJOSHADER_sdlContext), malloc_d);
if (resultCtx == NULL)
{
out_of_memory();
goto init_fail;
} // if
SDL_memset(resultCtx, '\0', sizeof(MOJOSHADER_sdlContext));
resultCtx->device = device;
resultCtx->profile = "spirv"; /* always use spirv and interop with SDL_gpu_spirvcross */
resultCtx->malloc_fn = m;
resultCtx->free_fn = f;
resultCtx->malloc_data = malloc_d;
return resultCtx;
init_fail:
if (resultCtx != NULL)
f(resultCtx, malloc_d);
return NULL;
} // MOJOSHADER_sdlCreateContext
const char *MOJOSHADER_sdlGetError(
MOJOSHADER_sdlContext *ctx
) {
return error_buffer;
} // MOJOSHADER_sdlGetError
void MOJOSHADER_sdlDestroyContext(
MOJOSHADER_sdlContext *ctx
) {
if (ctx->linker_cache)
hash_destroy(ctx->linker_cache, ctx);
ctx->free_fn(ctx->uniform_staging, ctx->malloc_data);
ctx->free_fn(ctx, ctx->malloc_data);
SDL_ShaderCross_Quit();
} // MOJOSHADER_sdlDestroyContext
static uint16_t shaderTagCounter = 1;
MOJOSHADER_sdlShaderData *MOJOSHADER_sdlCompileShader(
MOJOSHADER_sdlContext *ctx,
const char *mainfn,
const unsigned char *tokenbuf,
const unsigned int bufsize,
const MOJOSHADER_swizzle *swiz,
const unsigned int swizcount,
const MOJOSHADER_samplerMap *smap,
const unsigned int smapcount
) {
MOJOSHADER_sdlShaderData *shader = NULL;;
int maxSamplerIndex = 0;
int i;
const MOJOSHADER_parseData *pd = MOJOSHADER_parse(
"spirv", mainfn,
tokenbuf, bufsize,
swiz, swizcount,
smap, smapcount,
ctx->malloc_fn,
ctx->free_fn,
ctx->malloc_data
);
if (pd->error_count > 0)
{
set_error(pd->errors[0].error);
goto parse_shader_fail;
} // if
shader = (MOJOSHADER_sdlShaderData*) ctx->malloc_fn(sizeof(MOJOSHADER_sdlShaderData), ctx->malloc_data);
if (shader == NULL)
{
out_of_memory();
goto parse_shader_fail;
} // if
shader->parseData = pd;
shader->refcount = 1;
shader->tag = shaderTagCounter++;
/* XNA allows empty shader slots in the middle, so we have to find the actual max binding index */
for (i = 0; i < pd->sampler_count; i += 1)
{
if (pd->samplers[i].index > maxSamplerIndex)
{
maxSamplerIndex = pd->samplers[i].index;
}
}
shader->samplerSlots = (uint32_t) maxSamplerIndex + 1;
shader->uniformBufferSize = 0;
for (i = 0; i < pd->uniform_count; i++)
{
shader->uniformBufferSize += SDL_max(pd->uniforms[i].array_count, 1);
} // for
shader->uniformBufferSize *= 16; // Yes, even the bool registers are this size
return shader;
parse_shader_fail:
MOJOSHADER_freeParseData(pd);
if (shader != NULL)
ctx->free_fn(shader, ctx->malloc_data);
return NULL;
} // MOJOSHADER_sdlCompileShader
MOJOSHADER_sdlProgram *MOJOSHADER_sdlLinkProgram(
MOJOSHADER_sdlContext *ctx,
MOJOSHADER_sdlVertexAttribute *vertexAttributes,
int vertexAttributeCount
) {
MOJOSHADER_sdlProgram *program = NULL;
SDL_GPUShaderCreateInfo createInfo;
MOJOSHADER_sdlShaderData *vshader = ctx->bound_vshader_data;
MOJOSHADER_sdlShaderData *pshader = ctx->bound_pshader_data;
if ((vshader == NULL) || (pshader == NULL)) /* Both shaders MUST exist! */
return NULL;
if (ctx->linker_cache == NULL)
{
ctx->linker_cache = hash_create(NULL, hash_shaders, match_shaders,
nuke_shaders, 0, ctx->malloc_fn,
ctx->free_fn, ctx->malloc_data);
if (ctx->linker_cache == NULL)
{
out_of_memory();
return NULL;
} // if
} // if
LinkedShaderData shaders;
shaders.vertex = vshader;
shaders.fragment = pshader;
memset(shaders.vertexAttributes, 0, sizeof(MOJOSHADER_sdlVertexAttribute) * 16);
shaders.vertexAttributeCount = vertexAttributeCount;
for (int i = 0; i < vertexAttributeCount; i += 1)
{
shaders.vertexAttributes[i] = vertexAttributes[i];
}
const void *val = NULL;
if (hash_find(ctx->linker_cache, &shaders, &val))
{
ctx->bound_program = (MOJOSHADER_sdlProgram *) val;
return ctx->bound_program;
}
program = (MOJOSHADER_sdlProgram*) ctx->malloc_fn(sizeof(MOJOSHADER_sdlProgram), ctx->malloc_data);
if (program == NULL)
{
out_of_memory();
return NULL;
} // if
// We have to patch the SPIR-V output to ensure type consistency. The non-float types are:
// BYTE4 - 5
// SHORT2 - 6
// SHORT4 - 7
int vDataLen = vshader->parseData->output_len - sizeof(SpirvPatchTable);
SpirvPatchTable *vTable = (SpirvPatchTable *) &vshader->parseData->output[vDataLen];
for (int i = 0; i < vertexAttributeCount; i += 1)
{
MOJOSHADER_sdlVertexAttribute *element = &vertexAttributes[i];
uint32 typeDecl, typeLoad;
SpvOp opcodeLoad;
if (element->vertexElementFormat >= 5 && element->vertexElementFormat <= 7)
{
typeDecl = element->vertexElementFormat == 5 ? vTable->tid_uvec4_p : vTable->tid_ivec4_p;
typeLoad = element->vertexElementFormat == 5 ? vTable->tid_uvec4 : vTable->tid_ivec4;
opcodeLoad = element->vertexElementFormat == 5 ? SpvOpConvertUToF : SpvOpConvertSToF;
}
else
{
typeDecl = vTable->tid_vec4_p;
typeLoad = vTable->tid_vec4;
opcodeLoad = SpvOpCopyObject;
}
uint32_t typeDeclOffset = vTable->attrib_type_offsets[element->usage][element->usageIndex];
((uint32_t*)vshader->parseData->output)[typeDeclOffset] = typeDecl;
for (uint32_t j = 0; j < vTable->attrib_type_load_offsets[element->usage][element->usageIndex].num_loads; j += 1)
{
uint32_t typeLoadOffset = vTable->attrib_type_load_offsets[element->usage][element->usageIndex].load_types[j];
uint32_t opcodeLoadOffset = vTable->attrib_type_load_offsets[element->usage][element->usageIndex].load_opcodes[j];
uint32_t *ptr_to_opcode_u32 = &((uint32_t*)vshader->parseData->output)[opcodeLoadOffset];
((uint32_t*)vshader->parseData->output)[typeLoadOffset] = typeLoad;
*ptr_to_opcode_u32 = (*ptr_to_opcode_u32 & 0xFFFF0000) | opcodeLoad;
}
}
MOJOSHADER_spirv_link_attributes(vshader->parseData, pshader->parseData, 0);
SDL_zero(createInfo);
createInfo.code = (const Uint8*) vshader->parseData->output;
createInfo.code_size = vshader->parseData->output_len - sizeof(SpirvPatchTable);
createInfo.entrypoint = vshader->parseData->mainfn;
createInfo.format = SDL_GPU_SHADERFORMAT_SPIRV;
createInfo.stage = SDL_GPU_SHADERSTAGE_VERTEX;
createInfo.num_samplers = vshader->samplerSlots;
createInfo.num_uniform_buffers = 1;
program->vertexShader = SDL_ShaderCross_CompileFromSPIRV(
ctx->device,
&createInfo,
SDL_FALSE
);
if (program->vertexShader == NULL)
{
set_error(SDL_GetError());
ctx->free_fn(program, ctx->malloc_data);
return NULL;
} // if
createInfo.code = (const Uint8*) pshader->parseData->output;
createInfo.code_size = pshader->parseData->output_len - sizeof(SpirvPatchTable);
createInfo.entrypoint = pshader->parseData->mainfn;
createInfo.format = SDL_GPU_SHADERFORMAT_SPIRV;
createInfo.stage = SDL_GPU_SHADERSTAGE_FRAGMENT;
createInfo.num_samplers = pshader->samplerSlots;
program->pixelShader = SDL_ShaderCross_CompileFromSPIRV(
ctx->device,
&createInfo,
SDL_FALSE
);
if (program->pixelShader == NULL)
{
set_error(SDL_GetError());
SDL_ReleaseGPUShader(ctx->device, program->vertexShader);
ctx->free_fn(program, ctx->malloc_data);
return NULL;
} // if
program->vertexShaderData = vshader;
program->pixelShaderData = pshader;
LinkedShaderData *item = (LinkedShaderData *) ctx->malloc_fn(sizeof (LinkedShaderData),
ctx->malloc_data);
if (item == NULL)
{
MOJOSHADER_sdlDeleteProgram(ctx, program);
}
memcpy(item, &shaders, sizeof(LinkedShaderData));
if (hash_insert(ctx->linker_cache, item, program) != 1)
{
ctx->free_fn(item, ctx->malloc_data);
MOJOSHADER_sdlDeleteProgram(ctx, program);
out_of_memory();
return NULL;
}
ctx->bound_program = program;
return program;
} // MOJOSHADER_sdlLinkProgram
void MOJOSHADER_sdlShaderAddRef(MOJOSHADER_sdlShaderData *shader)
{
if (shader != NULL)
shader->refcount++;
} // MOJOSHADER_sdlShaderAddRef
void MOJOSHADER_sdlDeleteShader(
MOJOSHADER_sdlContext *ctx,
MOJOSHADER_sdlShaderData *shader
) {
if (shader != NULL)
{
if (shader->refcount > 1)
shader->refcount--;
else
{
// See if this was bound as an unlinked program anywhere...
if (ctx->linker_cache)
{
const void *key = NULL;
void *iter = NULL;
int morekeys = hash_iter_keys(ctx->linker_cache, &key, &iter);
while (morekeys)
{
const LinkedShaderData *shaders = (const LinkedShaderData *) key;
// Do this here so we don't confuse the iteration by removing...
morekeys = hash_iter_keys(ctx->linker_cache, &key, &iter);
if ((shaders->vertex == shader) || (shaders->fragment == shader))
{
// Deletes the linked program
hash_remove(ctx->linker_cache, shaders, ctx);
} // if
} // while
} // if
MOJOSHADER_freeParseData(shader->parseData);
ctx->free_fn(shader, ctx->malloc_data);
} // else
} // if
} // MOJOSHADER_sdlDeleteShader
const MOJOSHADER_parseData *MOJOSHADER_sdlGetShaderParseData(
MOJOSHADER_sdlShaderData *shader
) {
return (shader != NULL) ? shader->parseData : NULL;
} // MOJOSHADER_sdlGetShaderParseData
void MOJOSHADER_sdlDeleteProgram(
MOJOSHADER_sdlContext *ctx,
MOJOSHADER_sdlProgram *p
) {
if (ctx->bound_program == p)
ctx->bound_program = NULL;
if (p->vertexShader != NULL)
SDL_ReleaseGPUShader(ctx->device, p->vertexShader);
if (p->pixelShader != NULL)
SDL_ReleaseGPUShader(ctx->device, p->pixelShader);
ctx->free_fn(p, ctx->malloc_data);
} // MOJOSHADER_sdlDeleteProgram
void MOJOSHADER_sdlBindProgram(
MOJOSHADER_sdlContext *ctx,
MOJOSHADER_sdlProgram *p
) {
ctx->bound_program = p;
} // MOJOSHADER_sdlBindProgram
void MOJOSHADER_sdlBindShaders(
MOJOSHADER_sdlContext *ctx,
MOJOSHADER_sdlShaderData *vshader,
MOJOSHADER_sdlShaderData *pshader
) {
MOJOSHADER_sdlProgram *program = NULL;
ctx->bound_vshader_data = vshader;
ctx->bound_pshader_data = pshader;
} // MOJOSHADER_sdlBindShaders
void MOJOSHADER_sdlGetBoundShaderData(
MOJOSHADER_sdlContext *ctx,
MOJOSHADER_sdlShaderData **vshaderdata,
MOJOSHADER_sdlShaderData **pshaderdata
) {
if (vshaderdata != NULL)
{
*vshaderdata = ctx->bound_vshader_data;
} // if
if (pshaderdata != NULL)
{
*pshaderdata = ctx->bound_pshader_data;
} // if
} // MOJOSHADER_sdlGetBoundShaderData
void MOJOSHADER_sdlMapUniformBufferMemory(
MOJOSHADER_sdlContext *ctx,
float **vsf, int **vsi, unsigned char **vsb,
float **psf, int **psi, unsigned char **psb
) {
*vsf = ctx->vs_reg_file_f;
*vsi = ctx->vs_reg_file_i;
*vsb = ctx->vs_reg_file_b;
*psf = ctx->ps_reg_file_f;
*psi = ctx->ps_reg_file_i;
*psb = ctx->ps_reg_file_b;
} // MOJOSHADER_sdlMapUniformBufferMemory
void MOJOSHADER_sdlUnmapUniformBufferMemory(MOJOSHADER_sdlContext *ctx)
{
/* no-op! real work done in sdlUpdateUniformBuffers */
} // MOJOSHADER_sdlUnmapUniformBufferMemory
int MOJOSHADER_sdlGetUniformBufferSize(MOJOSHADER_sdlShaderData *shader)
{
if (shader == NULL)
return 0;
return shader->uniformBufferSize;
} // MOJOSHADER_sdlGetUniformBufferSize
void MOJOSHADER_sdlUpdateUniformBuffers(MOJOSHADER_sdlContext *ctx,
SDL_GPUCommandBuffer *cb)
{
if (MOJOSHADER_sdlGetUniformBufferSize(ctx->bound_program->vertexShaderData) > 0)
{
if (update_uniform_buffer(ctx, cb, ctx->bound_program->vertexShaderData,
ctx->vs_reg_file_f,
ctx->vs_reg_file_i,
ctx->vs_reg_file_b))
{
SDL_PushGPUVertexUniformData(
cb,
0,
ctx->uniform_staging,
ctx->bound_program->vertexShaderData->uniformBufferSize
);
} // if
} // if
if (MOJOSHADER_sdlGetUniformBufferSize(ctx->bound_program->pixelShaderData) > 0)
{
if (update_uniform_buffer(ctx, cb, ctx->bound_program->pixelShaderData,
ctx->ps_reg_file_f,
ctx->ps_reg_file_i,
ctx->ps_reg_file_b))
{
SDL_PushGPUFragmentUniformData(
cb,
0,
ctx->uniform_staging,
ctx->bound_program->pixelShaderData->uniformBufferSize
);
} // if
} // if
} // MOJOSHADER_sdlUpdateUniformBuffers
int MOJOSHADER_sdlGetVertexAttribLocation(
MOJOSHADER_sdlShaderData *vert,
MOJOSHADER_usage usage, int index
) {
int32_t i;
if (vert == NULL)
return -1;
for (i = 0; i < vert->parseData->attribute_count; i++)
{
if (vert->parseData->attributes[i].usage == usage &&
vert->parseData->attributes[i].index == index)
{
return i;
} // if
} // for
// failure
return -1;
} // MOJOSHADER_sdlGetVertexAttribLocation
void MOJOSHADER_sdlGetShaders(
MOJOSHADER_sdlContext *ctx,
SDL_GPUShader **vshader,
SDL_GPUShader **pshader
) {
assert(ctx->bound_program != NULL);
if (vshader != NULL)
*vshader = ctx->bound_program->vertexShader;
if (pshader != NULL)
*pshader = ctx->bound_program->pixelShader;
} // MOJOSHADER_sdlGetShaders
unsigned int MOJOSHADER_sdlGetSamplerSlots(MOJOSHADER_sdlShaderData *shader)
{
assert(shader != NULL);
return shader->samplerSlots;
} // MOJOSHADER_sdlGetSamplerSlots
#endif // USE_SDL3