154 lines
3.7 KiB
C
154 lines
3.7 KiB
C
/* Freetype GL - A C OpenGL Freetype engine
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*
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* Distributed under the OSI-approved BSD 2-Clause License. See accompanying
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* file `LICENSE` for more details.
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*/
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#include <assert.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "vec234.h"
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#include "platform.h"
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#include "vertex-attribute.h"
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// ----------------------------------------------------------------------------
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vertex_attribute_t *vertex_attribute_new(GLchar *name, GLint size, GLenum type,
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GLboolean normalized, GLsizei stride,
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GLvoid *pointer)
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{
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vertex_attribute_t *attribute =
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(vertex_attribute_t *) malloc(sizeof(vertex_attribute_t));
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assert(size > 0);
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attribute->name = (GLchar *) strdup(name);
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attribute->index = -1;
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attribute->size = size;
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attribute->type = type;
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attribute->normalized = normalized;
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attribute->stride = stride;
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attribute->pointer = pointer;
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return attribute;
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}
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// ----------------------------------------------------------------------------
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void vertex_attribute_delete(vertex_attribute_t *self)
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{
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assert(self);
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free(self->name);
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free(self);
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}
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// ----------------------------------------------------------------------------
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vertex_attribute_t *vertex_attribute_parse(char *format)
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{
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GLenum type = 0;
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int size;
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int normalized = 0;
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char ctype;
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char *name;
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vertex_attribute_t *attr;
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char *p = strchr(format, ':');
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if (p != NULL)
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{
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name = strndup(format, p - format);
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if (*(++p) == '\0')
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{
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fprintf(stderr, "No size specified for '%s' attribute\n", name);
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free(name);
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return 0;
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}
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size = *p - '0';
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if (*(++p) == '\0')
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{
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fprintf(stderr, "No format specified for '%s' attribute\n", name);
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free(name);
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return 0;
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}
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ctype = *p;
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if (*(++p) != '\0')
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{
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if (*p == 'n')
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{
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normalized = 1;
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}
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}
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}
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else
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{
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fprintf(stderr, "Vertex attribute format not understood ('%s')\n",
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format);
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return 0;
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}
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switch (ctype)
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{
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case 'b':
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type = GL_BYTE;
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break;
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case 'B':
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type = GL_UNSIGNED_BYTE;
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break;
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case 's':
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type = GL_SHORT;
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break;
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case 'S':
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type = GL_UNSIGNED_SHORT;
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break;
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case 'i':
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type = GL_INT;
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break;
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case 'I':
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type = GL_UNSIGNED_INT;
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break;
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case 'f':
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type = GL_FLOAT;
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break;
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default:
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type = 0;
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break;
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}
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attr = vertex_attribute_new(name, size, type, normalized, 0, 0);
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free(name);
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return attr;
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}
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// ----------------------------------------------------------------------------
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void vertex_attribute_enable(vertex_attribute_t *attr)
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{
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if (attr->index == -1)
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{
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GLint program;
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glGetIntegerv(GL_CURRENT_PROGRAM, &program);
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if (program == 0)
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{
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return;
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}
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attr->index = glGetAttribLocation(program, attr->name);
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if (attr->index == -1)
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{
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return;
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}
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}
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glEnableVertexAttribArray(attr->index);
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switch (attr->type)
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{
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case GL_UNSIGNED_SHORT:
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case GL_UNSIGNED_INT:
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case GL_UNSIGNED_BYTE:
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case GL_SHORT:
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case GL_INT:
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case GL_BYTE:
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glVertexAttribIPointer(attr->index, attr->size, attr->type,
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attr->stride, attr->pointer);
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break;
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default:
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glVertexAttribPointer(attr->index, attr->size, attr->type,
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attr->normalized, attr->stride, attr->pointer);
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}
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}
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